Do you mean problems like this:
[...]
oklein@smallo ~$ telnet panties.e.ruhr.de
Trying 193.101.110.1...
Connected to panties.e.ruhr.de.
Escape character is '^]'.
telnetd: ioctl(sctty): Operation not permitted
.
Red Hat Linux release 2.1
Kernel 1.3.91 on a i586
Connection closed by foreign host.
[...]
Strange enough, i have this problem on an intel box, on my Alpha, 91 runs
fine...
Bye, Olaf